A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

Few of the many visitors to this resort town know of its hidden Maya ruins.

A flooded Mexican cave that hides a river beneath the water.

This abandoned subway station can still be seen on regular commuter trips.

Wine bottle sculpture with a ship's stateroom inside.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This semi-hidden Manhattan restaurant is based out of a loading dock.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Nondescript elevator doors open to reveal a stunning, surreal world.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

Ride the subways of yesteryear.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A hands-on traveling collection of the innovative devices of yesteryear.

Read a book next to a Midtown waterfall.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

New York's oldest magic store.

Try not to get slimed in Tribeca.

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

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.