An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The oldest Roman lighthouse still in use.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Series of underground houses inhabited continuously for centuries.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

A French library that makes sure its love of books is writ large... giant in fact.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

One of the smallest bookstores on the planet.

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

A darkly erotic open-air statuary in Catalonia.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

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

An Italian hillside ghost town.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

Geometry and mystery come together in an epic show of octagonal masonry.

The tiny Spanish village that long refused to change its outrageously anti-Semitic name.

The gaunt visage of this angular Christ giant is enough to put the fear of God into all who see it.