Abandoned railway line circling the city of Paris.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Perhaps the most spectacular grotto along the Algarve coastline.

A unique seaside cave where Aleister Crowley faked his own death.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A hot dog stand where the heads are just as hot as the dogs.

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

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

All of Chicago's wood-paved streets are long gone but two alleys remain.

This historic hotel invented the chocolate brownie.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An enormous park-like oasis, full of famous Chicagoans’ graves.

A monument to the art of slicing people open.

A Bibliophile's Dream.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A lush green oasis in the middle of Chicago.

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

To truly appreciate Detroit's landmark skyscraper, you have to step inside.