This Florida sinkhole hides a rainforest-like micro-environment in its depths.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

Meet some of the most prominent figures in Black history through life-sized wax models.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A toxic ghost town sitting atop a massive coal fire.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

This elaborate towering structure was once famed for its revolutionary height.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Yo, Adrian!

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

A rare view of a preserved Victorian science museum.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.