Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The legendary building that needed ghostly approval before being built.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The world's only museum devoted to the wonders of fluorescence.

An enormous, inside-out glass globe built in 1935.

These fantastically named natural pools look like something out of a Scottish myth.

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

An emerald-green grotto just a short trip from Austin.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A kaleidoscopic warehouse-maze of handmade neon signs.