Stalactites and stalagmites in a beautifully lit cave.

Pompeii's less famous neighbor is still revealing her secrets.

An alchemist's "magic door" stands in the middle of a Roman park.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A 16th-century horror show built in a lovely Italian garden.

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

The above-ground crypts at this Catholic cemetery face north-south instead of the usual east-west.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

One-layer pyramid in Indiana.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

A peaceful place in the woods where everything is a work in progress.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This historic lavatory leftover features two levels of defecation stations completely without context.

A local scoured more than 1,000 acres for stone to create his masterpiece.

Curious cave that stays a cool 56 degrees all year long.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This century-old roadside attraction is full of bizarre rock formations.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

The world's longest known cave system.

A miniature city built by a single hunchbacked monk.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.