An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

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

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

35,000 grape hyacinths flow like water down a garden hill.

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

Friction between grains of sand cause a curious "singing" sound.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

An eccentric inventor's castle home with its own indoor weather system.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Mosaics, storks, and brothels—this ancient city has it all.

An ancient city hidden in the heart of the Sierra Nevada mountains.

Huge stone depressions which may have acted as an Incan agricultural experiment.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A bizarre house filled with an astounding array of collections.