A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

When you can't get to the Pacific, just go to Florida.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The Sun King's military models, saved from the Louvre.

This bridge was constructed from the rubble of the infamous Bastille.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The celebrated eyesore created by starry-eyed sweethearts.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

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

This unattributed sculpture in Amsterdam is hiding in plain sight.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

The history and future of cannabis.

The Emperor Tiberius' palace of debauchery.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

2300-year-old Roman road connecting the empire.