Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A monument to the forgotten French explorers and their landmark expedition.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The world's newest astronomical clock is also its most accurate.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The Giant Lemon of Lemon Grove.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

San Diego's most historic and haunted home.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.