This exceptional home was a 32-year labor of love by a man determined to build his wife the most beautiful stone house in the world.

This building is a recreation of the gatehouse that separated Los Alamos from the outside world during the era of the Manhattan Project.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

An extraordinary mixture of natural beauty and man-made phenomena.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

Century-old shop, specializing in Occult products.

This beloved marketplace mascot poops money and grants good luck.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Huge masonic hall in Philadelphia with lavishly themed rooms.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

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

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A rare view of a preserved Victorian science museum.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

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

A crumbling hospital from the 1850s on Roosevelt Island.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Nikola Tesla's former home contains an homage hidden from plain sight.