A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

A giant open-air sculpture made of over 200 full-sized boats.

An enormous illuminated figure dances on the Las Vegas strip.

These markers are used to determine the ground stability of the Strip.

The largest recovered section of Titanic sits in a hotel in Las Vegas.

The most extravagant car collection features a Batmobile, Liberace's mirror ball-ed Rolls Royce, and a stunt car from 'The Fast and the Furious.'

A magnificent collection of imperial armor and weaponry.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The Habsburgs' royal collections of art and wonders.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Housed in a former air raid shelter, this museum is dedicated to the history of computing and video games.

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

The narrowest house in Buenos Aires is less than 10 feet wide.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

From a 1930s bathing beach to a 1970s dumping ground, this stretch of Buenos Aires is now its largest and wildest reserve.

This public lavatory is home to a mini museum that explores toilets through time.

This cathedral's stained-glass patchwork of psychedelic colors and shapes was put in place long before the swinging 60s.

Four hundred years ago, this turned-about message was carved into one of Winchester Cathedral's exterior walls.

Ask nicely, and stewards of a centuries-old charitable tradition will give you free bread and beer.

This towering monument is dedicated in memory of a most unusually named, yet heroic, horse.