An encyclopedic collection of mammal penises.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Home to drunken tower-climbing goats... seriously.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

An exotic wildlife habitat right off The Strip.

The walls of the iconic dome are hollow and have a secret stairway.

A little sculpture with a large wardrobe.

Be(w)ar(e) the moat around this historic Czech castle.

World's first "penitentiary," meant to be humane, drove men insane.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

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

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Paris' linguistic guide to the international language of, yes, love.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.