This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The world's only museum devoted to the wonders of fluorescence.

This hilarious English intersection is an automotive whirlpool.

At high tide this strange footbridge appears to have no purpose whatsoever.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A subterranean playground in an abandoned slate mine.

A unique waterfall that some believe attracts the fairfolk.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

360° views of the city plus five floors of optical illusions and hands-on science.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

France's high-tech, future-themed amusement park.

A Gothic cathedral created from volcanic rocks.

The wreckage of an old coastal trading vessel is only visible at low tide.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.