This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This curious, round temple is the oldest still-standing marble building in Rome.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This ancient Roman arch misled treasure hunters for centuries.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

An enigmatic modern marker left next to a historic Roman site.

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

An iconic Soviet statue of working-class people.

Moscow's imposing monument to the Space Age.

Gargantuan home of Russian science.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This massive monument honors the first human in space.

Stalinist skyscraper built with help of cryotechnology.

Former headquarters of the KGB.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

A bulky, ancient stupa marks the site of Siddhartha Gautama's seminal Buddhist teaching.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This historic square in Nepal is home to temples dating back to the third century.

Siddhartha Gautama sat here and received enlightenment.

This magical place built as an astronomical center starred as a James Bond villain's lair.

Fantastic views and thousands of love locks.