The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Legend says this sacred tree was a gift from goddess Athena.

A historic building houses one of the most important archaeological institutes in Europe.

A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

Abandoned bridge hidden deep in the San Gabriel Mountains.

An offbeat angle on the ocean viewed through an antiquated lens.

A bigger-than-life pun that has become a beacon of altruism.

Even Henry David Thoreau found this glacial pothole irresistible.

A fantastic castle rumored to be the birthplace of King Arthur.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

The hallucinogenic center of the ancient world.

These aggressively sustainable art homes look like something out of 1970's science fiction.

The longest living non-clonal organisms on Earth.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

An obscure waterfall that looks like something out of a fantasy novel.

Remnants of a storybook amusement park hidden behind a strip mall.

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

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

One man's ambition created this psychedelic log home.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.