Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Statue commemorating the use of ether in anesthesia.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A fountain standing as a testament to a doomed alliance.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

The only recreation of William Shakespeare's indoor playhouse.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Lie in a hammock where George Washington stood.

Elevated freight railway turned wildly successful urban park.

A graffiti Mecca welcoming artists from around the world.

A celebration of capitalism in Midtown.

Read a book next to a Midtown waterfall.

Commemorating the spot where the famous scientist fed his pigeons.

There must be a pun in this haystack somewhere...

New York's oldest magic store.

Cryptic messages embedded in the New York City sidewalk.

The most confusing clock in New York.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.