This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

A miniature model of the iconic Stockholm department store.

An abstract representation of weather in Sweden.

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

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

These stained-glass windows are all that remains of a building that was the target of one of the biggest explosions in London after World War II.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A delightful museum entirely dedicated to the tiny homes of dolls.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Warsaw's fantastically preserved gasworks...almost.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

A massive mammoth bone has been on display inside this church since the 18th century.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

This hidden collection of everyday objects illustrates life within communist Poland.

A 20th-century picture show in 3-D.