Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

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

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

A meditative space out of a fantasy story.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

The wild west is still alive and well at this authentic mining town watering hole.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

The only theatre in the world constructed specifically for sound movement.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

Noble beasts perhaps, but not the Emperor's dogs.

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

The United States Capitol's former columns still stand.

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

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

At 207 feet, one of the world's longest continuous escalators.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The site of the climactic scene from the classic horror film is now a historic landmark.

This museum looks at the history of one of America's most famous prisons and most beloved albums.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.