A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

Obscure Freemasons still live in D.C.’s largest private residence.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

At a site that has witnessed many significant events, according to the fictional Kcymaerxthaere, it is best known as the place of lunar discovery.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

Three hundred years of preserved Spanish colonial history in San Antonio.

See the sky in a new way through this art installation.

The final resting place of an outlaw, whose legend grew after death.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

High-end dining has a home in this former gas station.

This little slice of old Jerusalem in Oklahoma is the evolution of a 90 year old passion play.

A museum and apothecary garden devoted to the history of frontier medicine.

Very likely the only museum in the world that celebrates the glory of the humble banjo.

A collection of beautiful crystals shaped like freshly plucked roses.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.