Only a few days into their European trip, twins Zach and Jeremy have lots of fun in London, but trouble awaits them in Amsterdam - where personalities clash, tensions rise, and a visit to the city's infamous red light district causes friction.

Zach and Jeremy travel through Bavaria without a plan. After an awe-inspiring tram ride to Germany's tallest peak, an eye-opening tour of Dachau Concentration Camp moves them beyond words. Meanwhile, Amy, Molly and Jake journey from Rome to Pisa, Italy.