The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

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

The largest outdoor art gallery in the Northwest United States.

At the time of its completion, it was the tallest dam in the world.

A cemetery housing wild west legends in South Dakota.

A majestic hotel that also stands as a historic relic.

The only road through the heart of Glacier National Park.

Spectacular views await visitors to this lake.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

A massive sea stack famous for its appearance in The Goonies.

A Roman-style column in Oregon hides a spiral staircase inside.

100-year-old shipwreck you can walk up to at low tide.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A wall of chewing gum moonlights as collective art.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.