Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

The most loyal of little dogs, or a Victorian era publicity stunt?

This ancient Hindu temple is covered in thousands of colorful statues and has a long mythological history.

A towering work of stone and philosophy that was constructed using ancient Hindu science.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

A blooming house of worship for the masses.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A miniature baseball stadium honoring Johnny Rosenblatt Stadium, home of the College World Series from 1950-2010.

A historic arena where the Beatles played their first concert in the U.S.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

A small town garden is dedicated to a psychic dog with the most soulful eyes.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

On the shores of Lake Superior, a small group of monks makes sacred sweets.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A Nesting Doll of Churches.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.