A showcase of engineering might that was also symbolic of westward expansion.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

One of the few remaining indigenous petroglyph sites in Nevada.

This collection of Dwarf beech trees were once believed to be enchanted trolls in disguise.

Locals say the water level in this 1,200-year-old tank never goes down.

A collection of sculptures that explore what's at stake when nature is thrown out of balance.

A massive rotating globe sits at the center of Babson Park.

A monument commemorating the antimony mine that once operated in this Melbourne suburb.

The metal truss bridge served as the sole entry point to an "isolation island" for smallpox outbreaks throughout the 1870s and early 1940s.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

One of the finest examples of a black soil prairie that was barely saved by the Great Depression.

Dedicated to one of the greatest military minds of the Maratha Empire.

The ruins of a monastery that dates to the 7th century.

The lasting remains of the Balloon Section of the British Armed Forces.

More than 10,000 small mirrors cover the curved surface of the world's second-largest solar oven, located in a remote village in Uzbekistan.

A series of bronze circus performers spread throughout a Slovakian shopping center.

The excellent Swiss museum of witchcraft is led by a modern witch.

The lobby of this hotel near the U.S.-Mexico border features a stained-glass mural that measures 42 feet long and 6 feet tall.

The crumbling remains of a once-grand building.

A drinking water fountain in the heart of Mumbai, built by a father in memory of his son.

This fortified L-shaped tower is the ancient seat of clan Hannay.

A magnificent work of architecture designed to honor a former military leader.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

The longest covered bridge in Delaware.