It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A museum dedicated to the alleged Roswell Incident.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

Ruins of a German Castle on top of a towering stone pillar.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

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

Architectureal fantasy quarter of Rome.

Once the most densely populated place in the world, this island is now a ghost town.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

An Australian lake whose pink hue defies scientific explanation.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This frequently-photographed waterfall takes only a short hike to visit.

360° views of the city plus five floors of optical illusions and hands-on science.

Staves, storm-calling, and of course, necropants.

An underwater city for the dead.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Macabre astrological automaton clock dating to the late 1400s.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Famously misunderstood wonder of the ancient world

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.