Abandoned Nazi train station turned underground astroparticle laboratory.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

Artillery recovered from the sea floor marks the spot of an extraordinary shipwreck.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This forgotten boat elevator was an engineering marvel in its heyday.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

The word 'wunderkammer' translates as 'wonder-chamber'. This Wunderkammer is both a museum and a retail store.

This piece of Australian modern art is part joke and part history.

It's home to the taxidermy remains of Peter, the dog who helped convict a murderer.

Unusual finds in this shrine to local law enforcement include a 19th-century vampire-slaying kit.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The world's oldest surviving music hall was also once a freakshow.

The final resting place of a poisoned lover whose death was at the center of one of Glasgow's most sensational murder trials.

The ornate structure is part of a building boasting more marble than the Vatican.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

The oldest house in Glasgow is now a museum dedicated to the city's medieval history.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

This astronomically-aligned stone circle was the first of its kind to be built in Great Britain after a 3,000-year hiatus.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

This East German military command bunker was ready for World War III.