The only fixed chain and post trail in Scotland snakes its way along the base of a towering seaside cliff.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

Inside a former cabaret, seven floors of erotic art.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Structure built from the skulls of vanquished foes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A ring of creosote bushes that are estimated to be 11,700 years old.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

A museum dedicated to the history and exploration of both popular music and science fiction.

An eccentric folk art landmark made out of discarded bottles by an inspired "grandma."

North America's largest accredited model railroad museum.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Home to the deepest rift anywhere on Earth.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This 700-year-old street food market features baby octopus and soy donuts.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

Last stop before the top of the highest peak in the world.

Everything from a plane to your own two feet are needed to reach this jungle resort.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

Sacred Buddhist home of some spiritual monkeys.