A wondrous old library overlooking the nation's capital.

A giant 400-acre preserve in North Florida for displaced wolves.

A hollow cement depiction of time's inexorable effect on the human body.

Exotic feline breeding compound and conservation center.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A 300-ship graveyard, with a few still visible at low tide.

Moonbows over Kentucky.

This massive redwood tree has a hole in the base big enough to drive through.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Travelers exchange letters with woodland creatures at this mini post office.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

The largest permanent Monopoly board makes one of the longest games even bigger.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Legends surround this jagged rock formation in the New Mexico desert.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

From scholastic to sepulchral - now under reconstruction.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

The longest living non-clonal organisms on Earth.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.