Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Slyly buy a shake in the Parker Meridien lobby.

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

A very classy 1920s-era bar right in Grand Central Station.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

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

This massive redwood tree has a hole in the base big enough to drive through.

The subtle science of a master molecular gastronomist.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

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

Op-art architecture designed for happiness.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

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

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

Become a prohibition rebel.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Read a book next to a Midtown waterfall.

A marvel of Byzantine engineering under the streets of Istanbul.

Collapsing castle on the Hudson river was once the storage site of military surplus business.