Hop aboard a charming bog train to explore this rare open-air museum of peat.

The abandoned military base looks like a post-apocalyptic wasteland.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

A beautifully eclectic mix of architectural styles.

This castle was designed to have as many windows as there are days in the year.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

A micronation on an islet along the coast of a Portuguese island.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

These small, triangular, colorful houses are a staple of Madeira Island.

A bike traffic circle showcasing the works of local graffiti artists.

These giant yellow bowling pins seem to be defying gravity.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

A 19th-century artistocrat's mansion, turned into a library, hidden in a modern library.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

An industrial site turned into Hungary's most cherished natural wonder.

The only natural cave bath in all of Europe.

The European equivalent of the Hollywood Walk of Fame is slowly spreading over the entire city.

The heart of Dutch football history.

The first crematorium in the Netherlands.

The oldest skyscraper of Europe now stands dwarfed by the surrounding structures.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

At the base of this tower, a plaque marks the original center point of the Netherlands.