Hollowed out cedar log tubs set in an ancient towering forest.

The angel of death appears to weep black tears at this grave marker.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

One of only two commuter aerial tramways in the United States.

Towering basalt columns, a creation of fire and ice.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

One person's lost luggage is another person's treasure.

A strange house built only at night, with rumored mystic inspiration.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A heavenly experience, right here on Terra Firma.

The world's longest known cave system.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

This frequently-photographed waterfall takes only a short hike to visit.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Take a drunken tour inside the world's largest known geode.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Make your reservation to have coffee with some kitties.

An underwater city for the dead.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A self-built castle made by a mysterious man.

This naturally-sourced hot spring is now home to a clothing-optional resort.