Its interior is adorned with some of the best examples of early Christian mosaics.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

A building so large that it has its own weather.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The ancient tomb acts as a calendar that keeps perfect time.

Famously misunderstood wonder of the ancient world

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

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

Ancient snack bar of the Roman Empire re-opened.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Every equinox this Maya pyramid puts on a spooky ancient light show.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The fairy tale castle of the "fairy-tale king."

In this truly magical place, rent hasn't been raised since the year 1520.

This huge ship ran aground and has simply been left to sit there ever since.

The first transatlantic wireless signal was received at this 17th-century fort.