Houses are tucked between, on, and underneath giant boulders.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A spiritual vortex among the red rocks in Sedona.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Commonly referred to as the most photographed Victorian home in the United States.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This dreamlike museum is filled with the works of an influential surrealist artist whose name you may have never heard.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

A hidden three-foot-wide house separates these two regal churches.

A building shaped like the Army Corps of Engineers logo, because why not?

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

This art display in Dedham honors a local fish, and is dedicated to the volunteers who restored the canal.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

Beside a busy highway, a colony of Great Blue Herons raises hundreds of offspring each year.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

A stunning garden filled with fantastical environmental folk art and sculptures.

100 massive sculptures in the Hudson River Valley.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

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