A small church that looks ordinary from outside. Inside hangs something that exists nowhere else in Europe.

A human arm. Real. Hanging from a chain since 1602. Blackened, untouched, impossible to remove.

I'll tell you what happened in this church on a winter night in 1602 — and why the arm is still there.

(Entry paid on site — small fee.)

In 2002, a worker repairing flood damage stepped on a wooden floor that gave way beneath him. Below — a sealed staircase. Below the staircase — a complete Renaissance alchemy laboratory, untouched since the 1600s.

We descend into it. The original ovens, the hidden tunnels that once connected this lab to Prague Castle, the niches where formulas were kept safe from the church's spies. This is where Emperor Rudolf II's alchemists searched for the philosopher's stone, the elixir of life, and the secret of immortality.

I'll tell you what they found — and what they didn't.

(Entry paid on site. Cash only - CZK, EUR or USD)

The most famous square in Prague — and the side of it most tours leave out.

The 27 white crosses set into the ground, where 27 Czech noblemen were beheaded in 1621, in front of a crowd of thousands. Tycho Brahe's grave in the Týn Cathedral — the astronomer who lost his nose in a duel and wore a metal one for the rest of his life. The Baroque columns, the Gothic spires, the medieval pavement — and the corners where, for centuries, the most important moments in Czech history played out.

The Astronomical Clock has been working since 1410. Most tours tell you it's beautiful and old.

I tell you who built it. What happened to him afterwards. And why, for 600 years, people in Prague have whispered that the clock is cursed.

The clock chimes. We watch the show. And then I tell you the part of the story that doesn't make it onto the postcards.