A world-class observatory in the California desert.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

This medieval village/restaurant perpetually celebrates the year 1376.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The land is home to swimming ponies and a legendary 18th-century treasure.

The highest point in Washington state is a volcano covered in glaciers.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

A psychological self-portrait in the form of a giant, segmented head.

The first park built over a freeway is a brutalist masterwork.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

This Seattle joint serves food inside an old train car once used by FDR.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

A unique attraction and museum dedicated to exploring iconic roadside structures.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Three prestigious academic collections come together to create a world-class natural history museum.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

This impressive tunnel was dug entirely by hand over the course of 36 years.