2300-year-old Roman road connecting the empire.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

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

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This ancient theater was once the home of fierce gladiatorial battles.

Museum in a swimming pool where the water still flows.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

France's national museum of scientific and industrial instruments.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

An abstract monument to a symphonic composer.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Macabre astrological automaton clock dating to the late 1400s.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.