A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A psychedelic labyrinth on the San Francisco bay.

Its buzzing collection honors vibrator history.

This large collection of tiny things revels in the art of fine machinery well made.

These small stands sell Malian snacks to worshippers and passersby after Friday prayers in Harlem.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

The former hotel where Tesla invented the radio.