Controversial site of what could be Europe's first pyramid.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

One of the most spectacular canyons in the world.

A fortified city, home to a remaining population of five families

Experience a charming 1930s version of "infotainment."

One of few lasting examples of the brief octagon craze that developed into folly.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

Quite simply the largest tree in the world (by volume).

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The final resting place of the great navigator, or maybe his brother.

Rome’s legendary peephole vista is also a former Crusader stronghold.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Architectural monsters are devouring this palace's every door and window.

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

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

Regency-era excess on the English Coast.

An unusual round church in London with a Templar past.

Macabre astrological automaton clock dating to the late 1400s.

This modest marker near Notre Dame identifies the very center of Paris.

Notorious artist squat renovated into legal studios.