Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The "lovely red Vega" of the legendary record-settling pilot.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

A hugely vast Irish landscape of barren rock that stretches for miles.

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

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Electrical pylon in the shape of Disney's beloved mouse.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The largest land animal skull ever discovered.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

This museum holds not just a world class collection of firefighting artifacts and gear but even the region's first fire station itself.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.