Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

Found: Garden of Eden in Miami-Dade County, Florida.

A mysterious castle built as a monument to lost love.

Possibly the world's largest coin stands just outside of a Canadian science center.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

This sparsely populated town offers a look back in time.

This popular pilgrimage site offers a hole filled with holy healing dirt.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

An overlooked memorial honoring the local Washington residents who died in World War I.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Decades before the scandal, this staircase on the river was a literal "water gate."

Largest Roman Catholic church in North America.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The oldest continuously operating fish market in the United States.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The national park was once a plantation estate.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.