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

Try not to get slimed in Tribeca.

Tucked in the back of this amazing antique store is an important piece of medical history.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A terrific purveyor of natural history objects and curios.

Notorious artist squat renovated into legal studios.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

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

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

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

These azure waters were thought to lead to the Mayan Underworld.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

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

Dedicated to the art of hunting, with juxtapositions of contemporary art.

The celebrated eyesore created by starry-eyed sweethearts.

A sculpture serving as an homage to Pope John Paul II.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Ghosts of France's colonial past.