At the top of the hour, this steam-powered clock's eight brass whistles play "Back Home Again in Indiana."

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Its unique collection details the history of the state's svelte railroads.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This 19th century granite fortification is one of the most well preserved forts in New England.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

One of the largest carillons in the world, this giant instrument has 67 cast-iron bells played by a keyboard.

While he no longer has an eatery to give him context, this off-brand Paul Bunyan still holds his giant hot dog with pride.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

An ancient Egyptian temple in the middle of Madrid, Spain.

A lush indoor jungle fills this bustling Madrid transportation hub.