A beautifully well-preserved ancient Roman villa.

"The greatest unknown literary treasure in Los Angeles."

Follow the original medieval paths that wind through this intriguing section of the city.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

An industrial site turned into Hungary's most cherished natural wonder.

The intended purpose of this unfinished Elizabethan building remains a mystery.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Step back into the glory days of Florida's nascent tourism industry at this Gilded Age palace.

A common entry point to the Griffith Observatory trail holds its own wonders.

The ghostly remains of what was once the world's richest copper mine.

In this African village, the walls of the chief's compound are painted with beautiful traditional designs.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

A safe space and resource for anything and everything relating to sex and sexuality.

Plenty of old carney magic still haunts this photogenic amusement park.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

One part local history, 99 parts gruesome haunted house.

A haunting theme park is slowly being swallowed by the jungle.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

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