Once America's tallest structure, now a Baltimore landmark.

The only remaining historic maritime signal station in the United States.

Its unique collection details the history of the state's svelte railroads.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

Ornate limestone building now filled with geologic specimens, and more.

It's a unique monument honoring a great character who inspired a generation of young women to be more and pursue their dreams.

Believe it or not, the now-ubiquitous California avocado originated in Guatemala.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

Four ionic columns from the Treasury Department building ended up in a park in Nebraska.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

When Motown musicians came to Nashville in the 1960s they stayed at this historic record-pressing company because hotels wouldn't host them.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

An emporium for the weird, creepy, rare, and just plain gross.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

Two massive rock outcroppings on the Oregon coastline.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.