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

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

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

This trio of stone spires claims to be the only preserved medieval execution site in Europe.

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

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

Stockholm's last remaining paternoster elevator.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

The concrete skeletons of an abandoned Swedish town hide among the trees.

A geological wonder that helped fuel myths of trolls and giants.

This Swedish automobile graveyard is a beautiful gallery of decay, but woe be to any who would steal a souvenir.

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

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

It was meant to help transport wounded soldiers to a secret underground hospital.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

A floating underwater hotel, created by a Swedish artist.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

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

According to legend, this boat-shaped henge is built over the grave of a mythic king.

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

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.