An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The two massive guns that defended Cartagena Bay.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

The remains of a Zoroastrian temple that bore witness to a time when Aden was a flourishing trading hub.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This small fort played a huge role defending Puerto Rico’s capital city.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This Brazilian palace island was once the site of the last grand ball before revolution.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

The headquarters of Korea’s provisional government later became the site of a prominent statesman's assassination.

A lightship turned museum, outfitted with artifacts from the vessel's past as part of the U.S. Lighthouse Service.

A British Commonwealth cemetery in the heart of Milan, with 421 allied soldiers died during World War II.

This environmental engineering marvel keeps salt water from the Elizabeth River.

Get up close and personal at this Fresnel Lens.

Honorable ranks graduating from the prestigious Army War College work hard to maintain their high standards of honor and erase those who don't.

The tunnel under the Capitol Building where Congress takes out its trash.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.