Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

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

An unrealized Taoist palace left abandoned in a Houston suburb.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

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

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

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

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Hidden in the hills is a mysterious stone structure, known only to a few.

An abandoned relic of the city's failed experiment with below ground transit.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Slyly buy a shake in the Parker Meridien lobby.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

Opulent downtown movie theater now houses cars as an indoor parking garage.

Detroit’s downtown castle is one of the oldest structures in the city.

The world’s largest Masonic temple was saved by the White Stripes.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.