For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Miraculous tree that seems to sprout out of solid rock.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

An ill-fated attempt to grow wheat in the sagebrush steppe of northeastern Nevada.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

A recreation of an Old West apothecary full of curios.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

This angular brutalist playground turns playtime into modern art time.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This small primate research island is teeming with playing, fighting wild monkeys.