Arches

This double-arched masonry highway bridge is the only structure of its kind in Minnesota.

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

This bird-shaped rock formation defies gravity, time, and classification.

A nearly lost tribute to an 11-year-old boy killed during a World War I homecoming parade.

This ancient Roman arch misled treasure hunters for centuries.

Unlike most arches, this geological oddity formed in a volcanic dike.

This magnificent 18th-century hall consists of a maze of nearly a thousand interconnected passages.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The arch that celebrated the completion of the Lincoln and Victory highways.

The fifth-longest natural arch in the world, and the longest outside China.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

This magical-looking island is notorious for the misfortunes suffered by its owners.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Natural arch offers panoramic views of Yangshuo's karst hills.