One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

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

Olfactory delights in San Francisco's Botanical Gardens.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A 140-year-old castle with underground caves hidden in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A lighthouse on this West Virginia lake started as a joke, then the forces of nature helped make it a reality.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

Time travel with sweets across history at this research-based candy store.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

This conical hill was built as a testing ground for an engineer known as the Glider King.

An eerie, derelict amusement park in Berlin.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

This bell stars in a tragic love tale and is said to make wishes come true.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.