This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

The unusual patterns in this rock formation result from two distinct modes of weathering.

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.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A collection of haunted objects and macabre oddities under one roof.

Feast your eyes upon hundreds of Nepal's native butterflies and moths.

A former Confederate hospital serves as a remembrance of wounded and dead soldiers.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.

Take an otherworldly journey in a school dedicated to out-of-body experiences.

America's first public mental health facility.

This historic mansion was built as a symbol of love between a husband and wife.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

An original apothecary from 1792.

An alternate history park where the Union Army loses the war... to dinosaurs.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.