There's something big lurking beneath the surface of this tiny Oregon park.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

The first declared National Monument in the United States.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

This 41,000-acre wetland complex is the largest marsh in the interior of the United States.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

Home of Howard Hughes' Spruce Goose.

The wooden airship was the largest flying boat ever built.

The legendary building that needed ghostly approval before being built.

The original "capsule building" is a masterpiece of Metabolist architecture.

New Plymouth, Idaho is the only U-shaped town in the United States.

The highest point in Texas is capped by a big silver pyramid.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.