The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Frida Kahlo's childhood home, now a museum of her life and works.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This replica of the Greek structure is in the heart of Nashville.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

New Orleans' famous cemetery, located on the site of a former race track.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

When ecosystems collide in the arid Southwest.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Northern Ireland's Brobdingnagian stepping stones.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The Boston square dedicated to the dark poet who was born nearby.