More than a century old, this trading post resides in the Navajo Nation.

A downtown park built on top of unclaimed graves.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

In the middle of a remote desert town is a surprisingly opulent hotel.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

On the Oregon coast is a natural hole that seems to be draining the sea.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

One of the oldest living oak trees in the Southeast.

This mural of the late David Bowie features eight colorful panels showcasing Bowie’s various alter egos.

This small, unassuming street is now a canvas for color and creativity.

Four tons of weapons merge together in a memorial against violence.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The world's brightest bioluminescent bay.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

Orcas on display and in the water.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

An out of this world experience.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.