Gothic tower mentioned in Thomas Hardy poem "The Channel Firing."

The world's largest private telescope collection hides in a secret wing of a Dutch auto museum.

A striking memorial to the Jews of Leiden who were murdered during World War II is scattered throughout the city.

The house of physicists Paul Ehrenfest was also a temporary dwelling and study for his good friend Albert Einstein.

A journey through 430 years of bulbiculture in the Netherlands.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

Albert Einstein would often sit in this chair during visits to the observatory to discuss science with Willem de Sitter.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

A surreal museum of extraordinary industrial objects.

It's always summer at the beach inside this former airship hangar.

The first, and perhaps only, monument dedicated to Wikipedia.

The romantic botanic tunnel feels like a well-kept secret.

What was once a bustling mining installation is now a bustling hub of contemporary art.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

A true Valhalla for cactus and succulent lovers.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

HBO series' stage tucked away in a Greenpoint lot is the largest theatrical set of its kind in the United States.

A decommissioned military complex that's now a modern industrial park.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”