This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

Northern Ireland's Brobdingnagian stepping stones.

A spherical "micro-nation" in the heart of Vienna.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Physicist’s epitaph provides final confirmation to a career of turmoil.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A "miracle" that seems to produce more holy fistfights than holy revelations.

Museum devoted to the artificial language of Esperanto.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

An urban laboratory.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Architectureal fantasy quarter of Rome.

Macabre museum devoted to historical Viennese murders.

A slice of central Asia in the middle of Berlin.

Budapest's Communist-era statues, banished to the suburbs.

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

A geological oddity topped with a 2,000-year-old pagan temple.

Hiding the longest subterranean river known in the world.

The topiary maze at the Habsburg hunting lodge.

Handsomely crafted representations of our round planet.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.