Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Commonly referred to as the most photographed Victorian home in the United States.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A small but immensely extravagant palace built by the "Night King."

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A symbol of Islam in oil-rich Brunei.

66,000 pieces of art, donated by one of the world's richest men.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Secret North Korean passage discovered below the world's most dangerous border.

The oldest church in Iceland is one of the few to feature ornate decoration.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

The Avenue of Mausolea is a series of grand palatial tombs.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The only theatre in the world constructed specifically for sound movement.

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

A dictator's gold statue once rotated to face the sun on a 75-meter high marble tower.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.