During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

One of the last free public hot springs is decorated with hippie art.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

An eerie, decaying ghost town destined to fade into the forest.

The longest continuous lava tube in Oregon.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

One of the ghostly stops along Route 66.

This little museum in the town where zombies were born celebrates the living dead.

A subterranean shelter remains intact under a busy Paris railway station.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

The remains of a ruined mansion memorialize the 1906 earthquake.

Geothermal waterfalls in Tuscany.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

In this century-old literary safehouse, print is alive and well.

The final resting place for the remains of 143 Habsburg royalty.

Abandoned bridge hidden deep in the San Gabriel Mountains.

Dig for your own trilobites in this goldmine of invertebrates.

Indents in the pavement are all that remain from a grisly death machine in Paris.