Tropical paradise strewn with hundreds of World War II wrecks.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

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

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A massive sea stack famous for its appearance in The Goonies.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

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

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

An inconspicuous footbridge beloved by San Diego locals.

Lucha Libre (Mexican Wrestling) themed taco shop.

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

The classic Atari game's iconic aliens have invaded downtown San Diego.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

A UFO scrapyard in the California desert.

The remnants of this Douglas fir predate Columbus's arrival in North America.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

Where America’s first doomsday cult awaited the end of the world.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

This elaborate towering structure was once famed for its revolutionary height.