There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

An eerily charming collection of salvaged buildings and curios grown out of a family scrap business.

A floating cat sanctuary on an Amsterdam canal.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

The world's tallest bridge is also possibly the most elegant.

A mysterious castle built as a monument to lost love.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

An Australian lake whose pink hue defies scientific explanation.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

Mongolian Buddhists believe this monastery in the Gobi desert to be the center of the world's spiritual energy.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

A tongue-in-cheek arcade where the games are based on everyday life.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.