A sculpture of a salmon swimming through a brick building.

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

A beautiful 62-acre Catholic shrine and botanical garden.

One of the oldest living oak trees in the Southeast.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

The secret city built by the Manhattan Project.

Christ's blood allegedly preserved in a Belgian town.

Constructed in 1882, this jail once housed local inmates and the sheriff's family all under one roof.

This underground holding cell was forgotten for over a century and rediscovered in the 1960s.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A network of concealed passageways lies within a busy London Underground station.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Where mountaineers were checked for lice before entering the city.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

The island where one woman reigned as a "queen" over 30-odd Japanese soldiers who refused to believe that WWII had ended.

A kaleidoscopic warehouse-maze of handmade neon signs.

The "Seinfeld" diner.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This naturally-sourced hot spring is now home to a clothing-optional resort.