Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Giant topiary dog once played a role in a terrorist bomb plot.

A memorial to the most decisive Native American victory of the Plains Indian War.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.

The colorful, smiling concrete silos of Vancouver.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

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

A wall of chewing gum moonlights as collective art.

A giant Troll lurks under one of Seattle's oldest bridges.

The ruins of an open-air theater built on this Georgia island in the 1970s.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Georgia's first brewery is also one of its oldest surviving buildings.

An early-19th-century hotel with a past that is steeped in the Civil War.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

"X" marks the spot of an echo chamber in the middle of a plaza.

Mai Tais and Navy Grog served up in one of the original tiki bars.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

One of the oldest, tallest, and most haunted lighthouses in America.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Take a dip in the world's largest mineral hot springs pool.