One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A stunning Victorian abbey and walled garden on a lakefront.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

This national landmark is also home to a massive treehouse.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

One man's swirling six-acre monument of stone.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

As state highpoints go, this spot is one of the lowest, but for years it was also the hardest to climb.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

A winding, cliffside stretch of road overlooking the Delaware River.

A pair of 19th-century granite markers symbolically record where the state boundaries of New York, New Jersey, and Pennsylvania intersect.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

You might want to bring a rain jacket to this travertine triple waterfall.

A mosaic map made of over 100,000 tiles depicts the geological features and sea creatures that live along this San Diego beachside community.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

One of the largest trees of its kind in California.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

Meet 'Big Josh,' the 20-foot-tall muffler man.