This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

This quirky collection of furniture also happens to be a public art installation.

A touching statue dedicated to Japan's first therapy dog.

This eclectic antique shop is home to the taxidermy remains of a celebrity lion named Simba.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

The castle still holds traces of the abandoned Roman fort it was built atop.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

The painting on an aptly named street honors the 1980s slasher movie.

This knockout museum lies in a sleepy corner of London.

The collection contains over 25,000 items and details the painful dental practices of the past.

The "shampooer of kings" who opened London's first curry cafe was a celebrity in the 19th century, but is all but forgotten now.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

A masterpiece of Art Deco architecture hidden in plain sight in West London.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

The celebrated eyesore created by starry-eyed sweethearts.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Noirish green neon marks the location of one of the oldest private detective agencies in France.