Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

These ruins reveal the remarkably intact layout of a Roman marketplace.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

This statue honors the thousands of Allied avians that served and died for France during World War I.

An astounding collection of taxidermy, fossils, skeletons, and even a few strange live beasts.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

This monumental mural crafted nearly 40 years ago is still in perfect condition.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

The world's largest reflecting pool is just two centimeters deep.

Historic medieval fortified city in southwest France.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Bohol's unusually shaped hills turn brown in the summer months.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Ancient human remains unearthed around the iconic monument.

The first archaeological site discovered by aerial photography.

Famously misunderstood wonder of the ancient world