On the Oregon coast is a natural hole that seems to be draining the sea.

Quite simply the largest tree in the world (by volume).

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

One man's homage to the sun continues to grow like a glass fractal.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

World's largest collection of serial killer artwork and other macabre exhibits.

A huge musical instrument played by the ocean.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A steam powered train that runs on city streets.

Believed to be the birthplace of the United States Marine Corps.

One of Philadelphia's largest murals resides hidden under this bridge.

Alexander Hamilton’s creation caused quite a bit of controversy.

This beloved marketplace mascot poops money and grants good luck.

A daily replay of the experiment that proved the rotation of the Earth.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This elaborate towering structure was once famed for its revolutionary height.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.