The Castle Gardens of Arcen are in the village of Arcen and offers 32 hectares filled with incredible landscaped gardens, parkland and a 17th-century castle. The garden is split into many smaller themed gardens, including a mountain garden with rock formations and waterfalls, and Mediterranean Casa Verde which houses the country’s oldest fig tree.

A masterpiece of Gothic architecture, this UNESCO World Heritage site is Germany’s most visited landmark, boasting stunning stained-glass windows and towering spires. Construction began in 1248 but wasn’t completed until 1880. Until 1884, the Cologne Cathedral was the tallest building in the world thanks to its towers which reach a height of over 500 feet.