The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

California's largest steel arch bridge.

Once an ancient sea, this landscape of rocky ravines is filled with the fossils of ancient marine life.

One room inside this building mesmerizes all with its parabolic dome.

An abandoned mine serves as a stark memorial of when mercury was a valued strategic metal.

This sculpture honors the man who was known as the "Righteous Among the Nations."

The flow from this waterfall sometimes comes out of springs below its rim.

Climbing the "mountain of frustration" is no easy feat.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

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

This colorful gate stands as an entrance to the walled city of Old San Juan.

This tower was once used to create ammunition for early settlers.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Rusted and decayed, this former mining site is a portal to the past.

This tower has survived the times despite being composed of mud and camel hair.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

His discovery kicked off the Gold Rush. One of the hands on this commemorative statue points to the spot where he found the precious metal.

This structure, built more than 60 years ago to manage devastating seasonal floods, is known to attract a rare species of freshwater dolphin.

Every summer, the Mendenhall River greenbelt comes alive with an explosion of magenta flowers.

Emerging from the sidewalk, this sculpture of a whale commemorates the importance of baleen in traditional Japanese puppetry.

A deep toxic lake fills this abandoned open-pit copper mine, now a Superfund site.

This Gold Rush ghost town was once the subject of a territorial dispute between California and Nevada.

As fallout from an irrigation project, a formerly cottonwood-lined stream is now a sandy, desolate, post-apocalyptic channel lined with weathered stumps and tumbleweeds.

The largest Christian church in the country is a complicated symbol of Spanish colonialism.