This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

A submerged archeological park still holds the wonders of a Roman Sodom.

A semi-scholarly approach to sex.

Eighteen miniature death-scene dioramas.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Resting place of Hollywood's immortals is also site of summer film screenings.

A trash dump made beautiful by nature's power.

A layered tribute to the work of mosaicist Isaiah Zagar.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

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

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A snapshot of the city's fascinating voodoo culture.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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