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."

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

The site of Paul Revere's historic two lantern warning.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

Home to the deepest rift anywhere on Earth.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

A collection of colorful dinosaurs hidden in an actual rainforest.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The arch that celebrated the completion of the Lincoln and Victory highways.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Experience a charming 1930's version of "infotainment."

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The drama of nature in full effect in this Nevada State Park.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.