The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The largest whale museum in Europe allows visitors to walk among life-size giants.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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

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

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

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

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This tiny museum's sizable collection is jammed into a former underground public toilet.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An encyclopedic collection of mammal penises.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The footprint of a frustrated devil in Munich's Cathedral.

Giant granite sculptures representing family on the northern coast of Spain.

Giant topiary dog once played a role in a terrorist bomb plot.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

At 207 feet, one of the world's longest continuous escalators.

This pun was simply waiting to come to life, and one defense contractor made it so.

A priceless collection of the Nation's cryptologic history.

The world's oldest continuously operating airport was founded by the Wright Brothers.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.