Considered the main attraction in Monastir and the best place to get a glimpse of ancient Tunisia, the Ribat built in 796 has been periodically renovated and reinforced to maintain its integrity and striking appearance. The oldest part of this defensive stronghold is situated around the lookout tower, which was built to locate enemy ships on the horizon. Visitors can climb the old watchtower for some expansive views over the city and visit some of the other more recent structures, such as prayer rooms that were added during the centuries following its inception. Film buffs might be interested to know that the Ribat has been used several times as a set for international movies such as Monty Python's 'Life of Brian' and 'Jesus of Nazareth'. Admittance to the fortress as well as the museum where some ancient artefacts are displayed is fairly inexpensive and well worth it.

Featuring sharks, penguins, seals and over 2,000 other species of aquatic life, the aquarium is a must-see in Boston. Deep-sea whale-watching tours on the Atlantic Ocean can also be arranged from inside the Aquarium.

Every visitor is aware of the existence of Amsterdam's red light district, locally referred to as De Wallen. Some head there straightaway while others prefer to walk around it — the choice is yours. The truth is, you will likely end up wandering through the area simply because of its location right in the city centre. The best way to get acquainted with the city's most notorious neighbourhood and discover its stories and secrets is by joining a walking tour. Follow your guide through winding cobblestone streets and narrow alleys as you learn the history behind Amsterdam's infamous adult destination. See, along the way, oddities like the world's first condom shop, the Museum of Prostitution, as well as little-known sculptures, and sex theatres.

A'dam is the iconic and controversial tall building next to the Eye Film Institute and opposite Central Station. It calls itself "a tower of many talents": you can grab a bite, work in a coworking space, rave at the club and spend the night at the hotel here. The tower hosts some major creative labels, so the crowd is always interesting. For some adrenaline, check out the A'dam Lookout — an observation deck with a panoramic view of Amsterdam, an interactive exhibition and free audio tour about Amsterdam’s history and culture. A swing that lets you dangle your feet off the edge of the building is the cherry on top.