A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Every autumn, this hillside is ablaze with red summer cypress.

A beautiful geyser under environmental threat.

New York City's smallest piece of private property.

Once the most densely populated place in the world, this island is now a ghost town.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The first declared National Monument in the United States.

Rising from the sea like a stone monster.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The atmospheric road was never meant to be so creepy.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Famously misunderstood wonder of the ancient world

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The rocks in this arid basin leave trails of movement behind them.

A winding path built in secret on the edge of the continent.

The United States Capitol's former columns still stand.

A giant Troll lurks under one of Seattle's oldest bridges.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This massive library holds what was once the largest book collection in the world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.