High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The fairy tale castle of the "fairy-tale king."

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

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

Dramatic river bend surrounds a natural red-rocked pedestal.

Medicinal spa created with the discharge from a geothermal energy plant.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Most-visited and most-photographed slot canyon in the American Southwest.

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

An exquisite tunnel of cascading flowers.

On Japan's Tashirojima Island, cats are king.

A magical place that lets you play in and explore the world of Studio Ghibli.

Rippling sand dunes frozen in the Arizona rock.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

The oldest Roman lighthouse still in use.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.