A house of courtship where the Jazz Age's most storied lovers got their start.

A little piece of Paris in the sultry south of the U.S.

An optical illusion found amid a logged redwood forest.

Hungarian self-built castle.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

A Rodeo for Prisoners.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This stately estate house features a tower covered in a bright, modern mural.

A treehouse assailed by the elements and the government, now gone.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

A real (but thankfully not live) missile stands tall as a monument to the United States military in the small town of Cordele.

The remnants of sheer survival in Dublin's monastery district.

The ruins of a creative scholar's fantastical unfinished sanctuary act as his massive gravestone.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The place where World War I began.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

The site where Confederate president Jefferson Davis was defeated has been marked with a bust... that leaves that part out.

This stone memorial commemorates a group of French patriots slain by French fascists.