one of the most difficult things for me to understand is

how all of these ancient ruins fit together,

but luckily we have Dr. Bernard Frischer

who has built an extraordinary video simulation

that allows us to move through this space.

The difficulty is always two-fold.

First of all, that ancient cities are now in ruins

so the one problem we have is

how do you go from ruins to the way

it did look in antiquity.

Secondly, we only have random ruins,

we don't have everything.

So even if you can visualize what the Pantheon looks like

or the Colosseum,

they are a mile apart in the city .

What was everything else? Most of it is missing.

So the visualization is trying to put the whole city together

And so let's take a look. Okay.

It is just beautiful.

We're now flying low over the city, over the Tibre.

It's a good place to start because you know,

the Tibre does divide Rome into two parts.

And I see in the distance a very large temple.

That's the Temple of Jupiter Optimus Maximus.

Jupiter, the best and the greatest,

which was the main temple of the Roman state cult.

And it's on top of the Capitoline Hill

which because of this temple and some others,

was considered the center of the state cult

and the state religion.

So what moment in Rome's history have you chosen?

This is notionally the year 320 AD,

the peak of Rome's urban development,

certainly in terms of public architecture

for the simple reason that

the Emperor at this time was Constantine the Great

and shortly after this year

he moved the capital from Rome

to his city of Constantinople.

Ok so we're flying up the river

and after the Capitoline Hill we see the Palatine Hill,

another one of the seven canonical hills of Rome.

And the Palatine is obvious to anybody who visits Rome.

If you're in the forum,

this is the great hill with the palaces.

In fact, the word palace derives from the word Palatine.

The Romans, as time went on in their history,

said "where ever the emperor is, there the palace is,"

or the paletine. So, the term palace got detached

from this physical hill

and came to just mean "a place where the ruler lives".

And actually as we're flying past

what is the Circus Maximus,

I see the imperial palace, it is so large.

It is literally enveloped the entire hillside.

We have to remember this was not only

where the emperor lived, and his family with him,

but it was also the center of the government.

any important relationship

between this enormous circus and the palace?

They are in fact connected

and the Emperor was a great giver of the circus games

and could easily come down to the Imperial box

from the palace,

or if he even wanted

he could watch the circus races at the Palace.

So we're not talking about Barnum & Bailey,

we're talking about sporting events.

We're mainly talking about chariot races.

Think Ben Hur, the very famous chariot race scenes.

And there were also animal hunts,

there were parades, religious processions,

and the triumphal processions.

So let's go into the city proper. We know that

Rome was this mercantile culture that has real markets.

How much do we know about

the daily lives of the inhabitants?

We know a huge amount.

We know about their hundreds of trades and professions,

the different social classes.

We know about their diet, we know about their longevity.

The scholars have really reconstructed in great detail

what everyday life was like.

So one of the most impressive structures

that I'm seeing is this aqueduct, this highway for water.

Yeah, the Romans are famous for their aqueducts.

They never could have had their big city

of a million or even the 2 million that

we're now seeing without the aqueducts

that brought water in from

20 or 30 miles away in the mountains.

They kept this gravitational sytem working

by getting the sources up into the mountains,

bringing it down into the city

and the valley which gave the force to the water.

And they were able to somehow calculate

a slope of even just 1 foot every 2000 feet,

which is remarkable.

We don't know how they could measure so accurately

so that the water kept moving gently downhill

but relentlessly downhill.

There is this kind of ambition,

this notion that man can control nature.

It does not need to build a city where the water is already,

but one can actually bend nature to man's will.

The Romans were remarkable engineers.

They used the water for drinking purposes,

obviously cooking, and so on.

But also a lot of these aqueducts

ended at great fountains,

but also in the great public baths.

So this area seems to be sort of set apart from

this denser, urban part of the city,

and these are the baths of Trajan.

Yes, these were not the first public baths,

but they were the baths

that gave the standard design for public baths.

Block of bathing buildings

in the middle of a kind of garden area,

delimited by a wall.

And we were talking earlier about the way

in which the emperors would provide for

the well- being of the city,

and this is really a prime example.

So now we are moving to some of the most

well known monuments in ancient Rome.

The Colosseum.

But we're in a fairly late moment in Roman history.

Before the Colosseum, wasn't there another palace here?

There was.

The Colosseum was built by the emperor of Vespasian,

who became emperor in 69 AD.

After the suicide of Nero, a very unpopular emperor.

One of the reasons he was so unpopular was that

after the great fire of 64 AD

in which a lot of the city was destroyed,

he took over 100 acres in the heart of the city

and converted it from private property

to his own personal use as a palace.

The Golden House of Nero.

And the Colosseum was actually a lake in that palace.

And Vespasian,

to show that he was a friend of the people,

filled in that lake and built a Colosseum on top of it.

The Colosseum was not originally called the Colosseum.

No. That's a term that

only goes back to the early middle ages.

The Romans called it the Flavian Amphitheatre

because the Vespasians' family name was Flavius,

so Flavian.

And it's an Amphitheatre, or kind of a double theatre,

an oval in shape.

The Romans certainly didn't call it Colosseum,

but they did call this enormous statue the Colossus.

It's a statue of the sun god.

Now you have mentioned that this is the moment

when Constantine rules Rome

and has not yet moved the capital to the east.

And it's interesting to look at his arch,

the arch of Constantine,

and realize that this is brand new.

It's only a couple of years old,

Constantine left Rome after he defeated Maxentius

at the Battle of the Milvian Bridge.

As far as we know,

he never came back to Rome to actually see it.

So we've just risen over the edge of the Colosseum

and we're looking down.

This is in a way, a mirror of Roman society.

The best seats are the ones farthest down,

closest to the arena,

and that was reserved for the emperor,

top office holders, priests, and so on.

Then behind them were the senators.

Behind them, the wealthy business men.

And behind them, the free born, normal citizens.

At the very top, sat women, slaves, and foreigners.

So what were they coming to watch?

As we can see now what's going on

is the main thing that we associate with the Colosseum,

the gladiatorial combats.

Another thing that went on here that

the Romans loved was hunts of wild animals.

The third thing is the execution of criminals.

Often in very colorful ways.

Ways we would find very cruel.

So let's make a left turn and move towards the forum.

What is that enormous temple?

It's the biggest temple of the state religion.

It's the temple of Venus and Rome.

It was built by the emperor Hadrian.

It's actually interesting because

it's two temples back-to-back.

One part of it is dedicated to the worship

of the goddess, Venus.

That's the one facing the Coliseum.

The other, to the goddess, Roma, that's facing the forum.

And there seems to be a reason for that.

Venus is looking at the Colosseum

which is associated with fun and games.

Otium, the Romans would say. Leisure.

Whereas Roma is a more serious goddess.

She's facing the forum which is the area of negotium,

or business and work.

Ok, so now we're moving over to the forum itself.

And we'll stop first at the Basilica of Maxentius,

the last of the great civic buildings

built in Rome before Constantine moved the capital.

This is a huge structure

and the word Basilica is familiar to us.

We often call churches "basilicas" now.

For the Romans it was a civic building

used mainly for courts,

the Christians adopted the building forum

because they worshipped inside,

so they adopted this preexisting building forum

and gave it a new content.

So now we're moving into

one of the most complicated parts of Rome,

especially when you try to look at the ruins

and understand how these buildings related to each other.

I always say the forum is like the wall in Washington.

It's a big open public space

used for public events like parades and speeches.

The buildings around that open space are also public

and they are courthouses and temples.

Then, on the forum plaza are,

as in the case of the wall in Washington,

monuments commemorating

great men and important events.

Adjacent to the forum,

private property was increasingly bought up

so that each emperor could build his own forum,

the so called imperial fora of the emperors.

We've made a full circle

and we're now looking again at the Capitoline.

We're flying over the Roman forum,

we'll acutally come back to it.

We're flying over the Capitoline hill,

we can see the temple of Jupiter Optimus Maximus,

and we're going beyond, back to the river,

where we find a big flat area of Rome

called the Campus Martius,

the field of Mars.

It was called that because in the Roman republic

when there was a citizen army,

the army would meet here and train.

Now, we've just moved over this lovely squared pond,

and we're looking at the flank

of an enormously important building, the Pantheon.

The rotunda, the round part,

we wouldn't really see in antiquity.