A collection of trees from various corners of the world call Stockholm University home.

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

This unique sculpture is often overlooked by pedestrians.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

One of the world's oldest continuously operating meteorological stations sits on a hill in Stockholm.

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.

Wooden cutouts of the fictional family from the popular Swedish comic strip take a stroll along the side of the road.

A miniature model of the iconic Stockholm department store.

The palace for King Gustav III was never completed, but the foundation remains tucked away in this city park.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This extensive collection covers thousands of years of Polish military history.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Sweden's oldest street has not changed for nearly a millennium.

A tiny town hall—in Sweden's one-time capital—might be the smallest in Europe.

A Swedish phone box converted into an informal village library.

Sculpture of a bus made from wrecked passenger cars.

Frequent fliers welcome in this airplane hotel.

The oldest Swedish built lighthouse still guides ships through the archipelago.

A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Tucked away in a downtown Stockholm park are the remains of a World War II defense position.