Make your reservation to have coffee with some kitties.

This abandoned boat was left in place thanks to its rotting beauty.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

A modernist landscape of water and sci-fi concrete.

The ghostly remains of an accidental sea.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A swing to dangle you off the very edge.

The rocks in this arid basin leave trails of movement behind them.

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

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An exquisite tunnel of cascading flowers.

Rippling sand dunes frozen in the Arizona rock.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An emerald-green grotto just a short trip from Austin.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Hollowed out cedar log tubs set in an ancient towering forest.

This lab's maddening silence is good for business but bad for sanity.

A layered tribute to the work of mosaicist Isaiah Zagar.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Stunning wetlands ablaze with pink lotus flowers.

Collapsing castle on the Hudson river was once the storage site of military surplus business.