Largest man-made excavation on earth!

What's a diner from the 1939 World's Fair doing in a remote Utah mountain town?

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A Mars simulation in the southern Utah desert.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

The largest island on the great salt lake is home to curious creatures and strange stories.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This geothermal hot spring hides beneath a slowly growing mineral dome.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Bizarre Cavern.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

This one-room cabin where the young colonel slept during the French and Indian War.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."