Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The largest self-built castle in the U.S., six decades in the making.

A fake mine that was made using real mining techniques which is also used as a community center.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Pilgrimage site for star-crossed lovers.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A beautiful 62-acre Catholic shrine and botanical garden.

An extraordinary mixture of natural beauty and man-made phenomena.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

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

A key producer of charcoal iron in the early 1800s, the structure still stands today.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A museum dedicated to the alleged Roswell Incident.

The Grand Canyon of Texas.