Castle to Castle is the latest in an ever-growing series of incredible road trips for Red Bull Racing Honda, which recently crisscrossed the US and Netherlands. Still, the latest episode from the Czech Republic and Slovakia tops them all. The thrilling ride from Prague Castle across the Charles Bridge and through the Moravian vineyards to Bratislava and the High Tatras, where David Coulthard meets Martin Šonka, in a 'world first' stunt between an F1 car and upside-down aeroplane.