The Paul Bunyan of the steel industry.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The earliest known map to show America, discovered by accident at a Paris bookshop.

More than 10,000 small mirrors cover the curved surface of the world's second-largest solar oven, located in a remote village in Uzbekistan.

The site where two doves fell in love.

The fragmented remains of a massive public bath connected to the city's water supply.

This banal Parisian entranceway is not what it seems.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Infamous and now demolished panopticon prison built by its former inhabitants.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

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

Just like in Hollywood, Madrid has also a forgotten walk of fame.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

This lucky bronze frog was gifted to Madrid by a casino.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

These ancient sea caves hold Britain's highest concentration of Pictish rock carvings.