A former department store turned into a quirky restaurant.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

The eroded core of an ancient volcano is now accessible by a short hike.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

A mysterious "wedding cake" castle in the middle of the urban desert.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

An artificial crater field that trained astronauts for lunar exploration.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Ancient pueblos built into the base of a natural canyon wall.

This historic national park is covered in the stunning ruins of red rock pueblos.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Huge masonic hall in Philadelphia with lavishly themed rooms.