Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The 10,000 Torii shrine.

See massive fossils that are over 200 million years old in northeastern Arizona.

Quite simply the largest tree in the world (by volume).

This massive library holds what was once the largest book collection in the world.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

One part local history, 99 parts gruesome haunted house.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

San Francisco's newly reopened hands-on science museum.

This classic restaurant features a gorgeous mirror-clad room.

The most visited, and possibly most controversial, museum in Germany.

The hallucinogenic center of the ancient world.

The celebrated eyesore created by starry-eyed sweethearts.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Elevated freight railway turned wildly successful urban park.