A man-made island in scenic San Francisco Bay.

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

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

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

The Habsburgs' royal collections of art and wonders.

The topiary maze at the Habsburg hunting lodge.

The famous winding walk at Chartres is surrounded in mystery and myth.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A hot dog stand where the heads are just as hot as the dogs.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The palatial McDonald's that inspired Wesley Willis.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This 1,500-acre development hopes to be the Central Park of the South.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This black shoreline is made up of exploded lava particles.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.