This Polish cave has housed a dragon, a brothel, and an enduring legend.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

Remnants from a time before electricity.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

For the last century, this international border within a small town has appeared and disappeared various times.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

A plaque in Madrid’s West Park marks the launch of a queer icon’s unlikely media career.

This statue includes the molehill that toppled a king.

The world's longest continuously running show has played at this small West End theater since 1974.

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

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

Once a resting spot for King Fernando VII.

One of the oldest structures in Helsinki is this burrow grave that dates back to the Bronze Age.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

Quality time with reindeer in the stunning scenery of their natural Lappish habitat above the Arctic Circle.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

On a small island, a replica of a Finnish village from the Iron Age.

A small island dotted with old, historic Finnish buildings.

A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.