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

This little blue house pokes out over the campus of UC San Diego, seven stories high.

Lucha Libre (Mexican Wrestling) themed taco shop.

San Diego's most historic and haunted home.

An inconspicuous footbridge beloved by San Diego locals.

A sharp bend in a dramatic river canyon cut through red rocks.

The hike to this stunning waterfall on a black sand beach is not for the faint of heart.

Thermal springs underneath the seabed provide the heat and bubbles for these beachside natural hot tubs.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

An exotic wildlife habitat right off The Strip.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

One of only two commuter aerial tramways in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Elevated freight railway turned wildly successful urban park.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A crumbling hospital from the 1850s on Roosevelt Island.

From Nunavut to Tierra del Fuego, you won't find any lighthouse higher than this one.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The world's smallest drawbridge.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.