The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Ancient ruins hidden underneath a modern luxury hotel.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Rome's ancient Etruscan rival, now a park full of ruins.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

2300-year-old Roman road connecting the empire.

Rare pigmented engravings cover the walls of this Stone Age shelter.

Once a meeting point for Swahili slave traders, this ancient tree is now a monument to those killed by the slave trade.

One of the largest concentrations of rock paintings in Southern Africa.

An obelisk marks the spot where a British explorer's heart was buried before the rest of his body was transported to England.

The petrified remains of 150-million-year-old trees can be seen in and among the houses of the local villagers.

Zambia's smallest national park is home to one of the world's largest annual mammal migrations.

Pompeii's less famous neighbor is still revealing her secrets.

A 16th-century horror show built in a lovely Italian garden.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.