A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

The world's second-largest sundial, made entirely out of stone.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A small but immensely extravagant palace built by the "Night King."

Tiny castle in the middle of the Rhine made you pay to pass.

Largest man-made excavation on earth!

A miniature city, once ruled by the Queen of the Netherlands.

It houses the remains of a 17th-century version of the Titanic.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Berlin's old airport.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A battle between nature and architecture in the Cambodian jungle.

Former headquarters of the KGB.

Hoax, mistake, or evidence of dinosaurs in human times?

Bridge that died in war and was resurected.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The ancient tomb acts as a calendar that keeps perfect time.

A fitting attraction for the corn capital of the world.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

A white Buddhist temple with a golden restroom.