A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Baroque celebration of the end of the Great Plague of Vienna.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Legends surround an ancient tree trunk riddled with nails for good luck.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

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

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

From silent movie theater to rock &roll palace and beyond.

A cobblestone alley with an interesting past.

Contemporary art inspired by natural history and science drawing on ancient techniques in a modern world.

A unique post-modern public space in the middle of the Warehouse District in New Orleans.

The whole world in one water tank.

Portlandia is the second-largest copper repoussé statue in the United States.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

This collection of hand fans doubles as a history of femininity.

A huge work of Burning Man-inspired outsider art on the grounds of a California winery.

This water tower commemorates the invention of the transistor on this site in 1947.

A monument commemorating the discoverer of radio astronomy.

A controversial memorial at the place where Captain Cook met his violent end.

Where the embers of the Big Bang were first detected.