Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

This private residence was the template for one of the most beloved television homes of all time.

Only hotel where you can legally launder money.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Where a demonstration led to equal rights for one of California's most marginalized communities.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

Gold Rush-era tombstones line the park's paths.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

Does being buried standing up help you get into heaven faster?

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

One of the oldest bridges in Norwich was used during the English witch trials and is said to be haunted.

A fifth-century temple improbably built into the side of a cliff.

The site of the notorious Great Train Robbery of £2.6 million, one of the biggest heists in English history.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."