Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

An entire subdivision was accidentally built on a flood plain, resulting in its eventual demolition—but the streets are still there.

This underwater old Texas hill town only resurfaces during harsh drought.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

All that remains of the Whittall mansion are the ruins of the formal garden and its pergola, dedicated to the late Matthew J. Whittall by his widow.

This Parisian café is dedicated to great tea and the art of knitting.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The celebrated eyesore created by starry-eyed sweethearts.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This massive library holds what was once the largest book collection in the world.

The oldest stone house in Paris was built by its most famous alchemist.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

The Wright Tavern is possibly the most important building in Concord Massachusetts to the American Revolution.

This railroad tunnel was once the longest in Massachusetts.