The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A secret greenspace hides atop a Capitol parking garage.

The most accurate timepiece in the world.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

This university transit system is a 1970s vision of the future.

The highest point in Maryland is only accessible by hiking through another state.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

This small, unassuming street is now a canvas for color and creativity.

A spiritual vortex among the red rocks in Sedona.

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.