This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A cake-themed art installation tucked away in historic Chinatown.

The beehive-like buildings of this abandoned resort reside near the border of Mauritania and Senegal.

One of the oldest standing structures in Montgomery County, Maryland.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This enormous sinkhole hides a secret world created from divine wrath.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

It's believed Matilda Fitzwalter's life was the basis for the famed literary figure.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This ancient amphitheater was restored in the early 1990s.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

A lonely memorial to the Challenger Space Shuttle, honoring the astronauts who died in 1986.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

The nearly 120-year-old piece of pork wears a brass collar and was once a man's "pet ham."

These massive concrete balls were used to mine gold in Virginia.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

This sculpture of a bowler hat is complemented by a matching umbrella a few blocks away.