The unique collection includes bronze cast handprints of some of America's most famous astronauts.

A building so large that it has its own weather.

Former villa and estate of James Deering developed to preserve native tropical forests.

A mysterious castle built as a monument to lost love.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

A historic presidential getaway on the continental United States' southernmost island.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

Home to three historic ships from the age of Vikings.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

The deepest metro station in the world.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

The Natural History Museum that time forgot.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This massive underground salt mine now holds a sci-fi theme park in its depths.