This hidden art nouveau gem was designed by an architect in search of a national style.

Museum dedicated to the terror regimes of Hungary.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

These unique stained glass windows were designed by local children using a modern flair.

A centuries-old iron mine is now a paradise for explorers, divers, and spelunkers.

Only spot in the world where an HVDC powerline, a single phase AC and a three phase AC powerline all meet.

This restaurant gives a new meaning to farm-to-table cuisine.

The trailblazing Swedish businesswoman created a beloved minty candy called polkagris.

The official meeting point for the oddly named governing assembly of ancient Sweden.

This pyramid in southern Sweden houses the remains of an eccentric nobleman, who spent his life doing whatever he felt like doing.

A Japanese video game arcade hides in the back of a Swedish pool hall.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

Sweden's "good old days" painstakingly re-created in a model village.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

This home on a quiet suburban street is completely covered with vibrant mosaics.

A beautifully eclectic mix of architectural styles.

A remarkable medieval structure born from a 14th-century disaster.

Built in the 1300s, this magnificent building that hosted England's kings and queens transports you to the Middle Ages.

This amazing 15th-century mural remained hidden in plain sight for centuries.