Fortified medieval tower house with lovely roof garden.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The attic of a four-century-old canal house hides a clandestine church.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Europe's official "zero-level," the equator of elevation.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

Go through the looking glass in Tokyo's Wonderland-themed shop.

More than 300 years old, Kyoto's historic "teahouse" still operates as an invitation-only geisha club.

The 10,000 Torii shrine.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

After much poking and prodding, this island is decidedly not a magnetic anomaly, but it sure is pretty.

The only pollutant in the clear blue water is sunscreen.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.

One of the first big sculptures anywhere in Australia.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Electrical pylon in the shape of Disney's beloved mouse.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.