More than 100 steam and diesel locomotives bring Colorado’s rail heritage to life.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

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

A volcanic cone that formed over 600 years ago.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A natural dome made of volcanic glass in Inyo National Forest.

In a beautiful open space on the north side of the Palmer Divide sits one solitary 19th-century gravestone in a copse of trees.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

One of Hawaiʻi’s most notable historic petroglyph fields lies within a major resort.

One of Hawaiʻi’s largest petroglyph fields contains a number of depictions of people.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

A little-known hot spring haven right below the highway.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

A singular collection of hand-built art deco cars are held in a building with style to match.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Believed to be the birthplace of the United States Marine Corps.

An Irish Memorial commemorating those who perished due to potato blight.