The largest self-built castle in the U.S., six decades in the making.

See the sky in a new way through this art installation.

This downtown Dallas art installation is always on the lookout.

A serene temple with stunning stained glass hides in downtown Dallas.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

For decades these polar bears have roamed all around a Nashville neighborhood.

One Confederate statue that accurately reflects the ugliness of its subject.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A motel dedicated to Southwestern nostalgia.

This sanguine boulevard was named after a deadly cowboy bar fight.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

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