Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Community bookshelf of 25-foot-tall book spines.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The site of Paul Revere's historic two lantern warning.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A bigger-than-life pun that has become a beacon of altruism.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The highest point in Washington state is a volcano covered in glaciers.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A surreal landscape where fanged rocks rise from the ground and the ocean feels like a great mystery.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This downtown Dallas art installation is always on the lookout.

The drama of nature in full effect in this Nevada State Park.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This private residence was the template for one of the most beloved television homes of all time.

A bit of retro transportation flair preserved in the world's largest department store.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

A massive sea stack famous for its appearance in The Goonies.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.