In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

Pizza with a side of fine art.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A lush green oasis in the middle of Chicago.

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

This colorful gate stands as an entrance to the walled city of Old San Juan.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

This bridge was constructed from the rubble of the infamous Bastille.

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

An ancient knight and a symbol of the city's freedom.

Where the lovelorn find a home for their sentimental keepsakes.