You can experience a vibrant splash of colour in the heart of Bremen in May, when Bremen's Rhododendron Park is in bloom. The magnificent colours of more than 10,000 rhododendron and azalea bushes are a delight for the eyes. Plant lovers will be delighted by the park's botanic garden, with its collection of more than 6,500 plants from all over the world.

Tower of London is one of the most famous fortified buildings in the world. It's also a mysterious place full of dark secrets, strange stories and historic relics. Here you can admire the priceless Crown Jewels, explore the Medieval Palace, visit the infamous Bloody Tower, and go on a tour with a Yeoman Warder to learn about the many executions that took place here.

The Bremen Town Musicians is a fairy tale by the Grimm brothers that has brought fame to the city of Bremen. The story is about a donkey, a dog, a cat and a rooster in search of a better life in the city of Bremen, where they plan to become musicians. Today, a two-metre tall bronze statue stands on the left, western side of the town hall to pay homage to this popular German tale. It depicts all of the characters on top of one another, with the donkey as the base. If you decide to visit it, make sure if you grab both of the donkey's front legs for good luck.

The Valentin bunker is a historical landmark that served as a submarine shipyard for the Nazi regime during the Second World War. It's the largest bunker in Germany, not to mention that it was one of the largest armaments projects of the Nazi era. Today, it's a memorial site which includes exhibits of eyewitness statements, historical photos and other information about the lives and conditions endured by the labourers once forced to work here. You can visit the bunker on your own or join a guided tour.