The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

Home to items never before seen by the public.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A hip bar decorated with walls of golden skulls.

This small New York museum celebrates the mountainous artwork of a Russian mystic.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A semi-scholarly approach to sex.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.