Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A slice of central Asia in the middle of Berlin.

The first declared National Monument in the United States.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A beautiful 62-acre Catholic shrine and botanical garden.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Mysterious rocks that ring musically when struck.

Started as a kitchen garden, now the second largest botanical garden in the world.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The only theatre in the world constructed specifically for sound movement.

Stroll through a wonderland of stupendous moss-covered trees.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A winding path built in secret on the edge of the continent.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A 16th-century horror show built in a lovely Italian garden.

The sign at the garden gate reads: "These Plants Can Kill."

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.