Erosion and time have created a naturally-formed water park.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Curious cave that stays a cool 56 degrees all year long.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

An artificial crater field that trained astronauts for lunar exploration.

A Wild West jailhouse that slid down the mountainside.

This massive marble memorial was built bit by bit either out of devotion or spite, but at the expense of the surrounding town.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

This historic cliffside mansion uses a natural cave for air conditioning.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

Lone survivor from Custer's Last Stand forever preserved.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

A tiny racehorse graveyard in the middle of a quiet Kansas City suburb.

This abandoned prison castle has become an imposing gallery of graffiti art.

A museum celebrating the Victorian obsession with hair art.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

This abandoned 19th century orphanage started as a boarding school for children of Civil War veterans.