Moonbows over Kentucky.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

This everlasting lightning storm may be the world's largest generator of ozone.

A popular swimming hole that hides one of America's most deadly diving spots.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

A submerged archeological park still holds the wonders of a Roman Sodom.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

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

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

New York's oldest magic store.

Once a year in Pomuch, the dead are taken out for a cleaning.

A monster in the plant world, up to 10 feet tall and smelling of death.

270 million year-old forest of stone.

The giant skeleton sculpture is surprisingly well-traveled.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

An enormous, 30-story-deep hole in the middle of Guatemala City.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

World's only nuclear reactor operated by liberal arts undergraduates.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

A heavenly experience, right here on Terra Firma.