Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

Huge otherworldly domed rocks on the shore of a deadly lake.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

Along a California highway is a kind of Jurassic Park made of metal.

A monument to a one-legged kidnapper, horse thief, and charlatan asks visitors to throw rocks in a pile.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

This giant temperature attraction created some giant electric bills.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A popular tourist cave with a dark past.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

It would be a crime to miss it.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

North America's largest accredited model railroad museum.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

An inconspicuous footbridge beloved by San Diego locals.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

San Diego's most historic and haunted home.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

An enormous and lavish Gothic church in Czechia.

Europe's second largest ossuary wasn't discovered until 2001.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Go inside to really appreciate this 500-year-old technological masterpiece.