This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A bright little alley in La Boca is a part of tango history.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Legends surround this jagged rock formation in the New Mexico desert.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The last bastion of Roman presence north of the Alps looms over a German town.

A meteorite-bounded town in Bavaria.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The fairy tale castle of the "fairy-tale king."

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The first Russian Orthodox church in North America and an Alaskan landmark.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The king of U.S. high points towers over every other peak on the continent.

A fountain standing as a testament to a doomed alliance.

Ancient serpentine sacrifice holder that has stood the test of time.

The ancient latrines of the Greeks, in all their public glory.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.