A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

Floating swimming pool within a moored vessel.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

An alchemist's “magic door” stands in the middle of a Roman park.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

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

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

Science meets wall art to highlight the beauty of famous mathematical equations.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.