The oldest surviving presidential residence in the United States.

A legendary boxing venue and ring featured in Rocky V.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

The abandoned coal loading dock is a canvas for unsanctioned art.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

The Andean town where every single building is decorated with a brightly colored frieze.

The world's largest ecosystem of its kind is home to South America's only native species of bear.

Known as the site of 'El Dorado,' this mysterious lake is rumored to hold gold beneath its waters.

This picturesque mansion has gone from opulent ruin to nature museum.

Secret Swing.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

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

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

A collection of weird and wonderful art fills a former houseplant nursery.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

An abandoned beach resort in Normandy reclaimed by artists.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."