When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

San Francisco's newly reopened hands-on science museum.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A modern frieze of ancient Grecian mythological figures playing a national pastime.

The original place where water met land in the City by the Bay is outlined in brass.

With the touch of a button, you can read a randomly selected short story.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

The world's largest collection of the world's largest objects is in one small Illinois town.

Ingenious bakery opens up the first Cupcake ATM at their flagship location in Beverly Hills.

Ever wanted to can Spam?

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

See where Bill Murray kidnapped a hapless Punxsutawney Phil.

This small-town opera house has appeared much more in national culture and history than its charming setting might suggest.

The classic Christmas carol was written at this Massachusetts tavern in 1850.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.