The attic of a four-century-old canal house hides a clandestine church.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Amsterdam's former hotspot for public executions and dissections.

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

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

A beautifully eclectic mix of architectural styles.

Christ's blood preserved in a Belgian town.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This theatre was made famous after Lee Harvey Oswald was captured inside watching a film.

This Bangkok high-rise looks like a rudimentary LEGO elephant.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

A wooden street sign is the last remnant of this 400-year-old alleyway.

The Swedish flag over this small naval fort signals that the nation is at peace.

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

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Sweden's oldest animated sign is still lighting up the skyline today.

Early habitat dioramas and home of the elusive gaff, the skvader.

Sound travels strangely in this underground whispering gallery.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.