A remarkably opulent mansion with a tragic history.

This abandoned Victorian-style house was built in 1884.

This temple was constructed entirely by Roman soldiers.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Obscure Freemasons still live in D.C.’s largest private residence.

An Industrial Revolution-era public work that purified water using nothing but sand.

A sculptor's dream castle turned fantastical ruin.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

The above-ground crypts at this Catholic cemetery face north-south instead of the usual east-west.

Many of the murals covering this sleepy Florida town hide some sort of intentional error.

This site is both a remarkable reminder of the town's mining history and a fantastic government blooper.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Spend the night in this formerly abandoned traditional Scottish village.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

In the hometown of the Grand Ole Opry star is a larger-than-life memorial statue made entirely from chicken wire.

Abandoned for 60 years, this submerged bridge was completely forgotten until the lake was drained.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.