An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A galley-shaped memorial to the prisoners of an infamous fortress.

A town saturated in Italian rationalist architecture was once marshland drained by Mussolini.

These pools have been abandoned for over 20 years.

This former fascist summer camp was abandoned for decades.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

This abandoned Brutalist treehouse is a hidden architectural relic.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Stalactites and stalagmites in a beautifully lit cave.

Pompeii's less famous neighbor is still revealing her secrets.

2300-year-old Roman road connecting the empire.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

An abandoned train station in Munich constructed for the 1972 Olympic games.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

An abandoned swimming pool decays on the outskirts of Berlin.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.