A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

A cemetery housing wild west legends in South Dakota.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Just a man taking his prehistoric pet for a stroll.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A fitting attraction for the corn capital of the world.

A town honors its legacy of traditional American Indian pipe carving with one gigantic pipe.

At the turn of the 20th century, the Minnehaha County courthouse played host to sensational public divorce trials.

One devoted couple has donated multiple recreations of Michelangelo's sculptures to this South Dakota town.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This eclectic homestead is home to a miniature windmill and Connecticut's last tollbooth.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

Over fifty whirling pools left by the glacial age.

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

A monument to the Mohawk people stands along an old Native American trade route.

Resonating tubes make music from highway overpass.

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.

You can get anything you want at the former site of the restaurant immortalized by Arlo Guthrie.

The mansion home of author Edith Wharton.

The site of the first "historically true" UFO encounter in the U.S.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.