Deep in the forest of northern Denmark, this secret underground bunker was built at the height of the Cold War.

The oldest tofu shop in the United States is a firm favorite with locals.

The seamy, underground secrets of Portland's criminal past.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

America's most famous piece of self-built architecture.

One of the last free public hot springs is decorated with hippie art.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

A 19th-century mansion houses the largest collection of gin in the European Union.

The formidable fowl can be found standing near an isolated hiking path.

This rock formation named for its unique shape is one of many that call the Alabama Hills home.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

An eccentric millionaire's personal curio collection includes at least one shrunken head.

This wilderness hike to a waterfall has an unlikely beginning in suburban Reno.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This settlement on the original Transcontinental Railroad began by harvesting timber, but transitioned to a forgotten 19th-century industry: harvesting ice.

One woman's Viking Castle on Lake Tahoe.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

A breathtaking 19th-century trail overlooks Lake Tahoe.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

This sublime architectural marvel is a rare example of an expressionist church.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

This classic restaurant features a gorgeous mirror-clad room.