The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This municipal playground was co-created by the father of one of the most playful characters ever.

This remarkably simple jail went over a century without an escape.

The first safe in this California town had to hold all the gold.

The oldest continuously operating church in California.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

Portlandia is the second-largest copper repoussé statue in the United States.

The magic's in the hole!

The ghostly remains of an accidental sea.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

Version of the French Riviera destroyed by the sea.

A crumbling hospital from the 1850s on Roosevelt Island.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

What's that on the side of that building? Va Va Voom, it's Bettie!

The tale of a strong-willed woman who stood her ground when the commercial world came rumbling in.

Granting the right of way to ships over surface traffic since 1917.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

This former coal gasification plant found a curious second life as a popular public park.

A beautiful final resting place for some of the noteworthy deceased.

A museum dedicated to the history and exploration of both popular music and science fiction.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This historic building provides a powerful glimpse into the lives of Japanese Americans forced to relocate during World War II.

A wall of chewing gum moonlights as collective art.