Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Descend into the tunnels to experience the life of a coal miner.

This hidden 13th-century tavern room has a few Shakespearean connections.

Visit these gentle, bell-bottomed, exquisite equines at the home of North America's first Gypsy Vanner horses.

The site of a mysterious pony massacre is rich with extraterrestrial conspiracy theories.

These free-roaming horses were once destined to disappear from the land.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Singing sand that stands as the final remains of an ancient lake.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

A resilient tree that has survived for more than 700 years in Guánica Dry Forest.

Inside this museum is an ongoing excavation of an ancient shipwreck.

A secret rendezvous spot where John S. Mosby and his Rangers would meet to divvy up their loot after raids.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The remains of a chapel created for convenience.

A Hungarian optometrist's charming collection of Asian art and curiosities.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.