© Reuters

Berlin, Germany - Back in 2015, Berlin promised to build a more bike-friendly city, after a referendum received more than 100,000 signatures.

© Reuters

Berlin, Germany - Though exact details about the improvements are scarce, Berlin is still considered to be one of the safest European cities for bikers.

© Reuters

Ljubljana, Slovenia - Politicians continue to push for bike-friendly developments in the Slovenian capital, which makes sense, as there's a biking population of all ages and backgrounds.

© Reuters

Ljubljana, Slovenia - Cycling is considered to be the best way to journey around Ljubljana. The flat city can be easily explored, with bike rental services around the city.

© Reuters

Barcelona, Spain - Barcelona has stunning architecture and city planning, and cyclists are welcome to explore the city streets.

© Reuters

Barcelona, Spain - There's many bike sharing schemes around the city. Traffic has also been redirected to make cycling more pleasurable in the city center.

© Reuters

Bogotá, Colombia - Bogotá has promoted biking by introducing No Car Day in 2018. There are many bike-focused initiatives in the city, making it increasingly more safe for cyclists.

© Reuters

Bogotá, Colombia - There's been a consistent issue of wearing helmets, but apart from that, Bogotá is developing the right infrastructure for cyclists to thrive.

© Reuters

Bremen, Germany - The north German city has the country's highest bicycle modal share, with 25% of the population using bikes compared to other transport.

© Reuters

Bremen, Germany - There's over 400 miles (640 km) of separated cycle tracks, and 2018's Green Mobility Plan has made life easier for Bremen's bike riders.

© Reuters

Helsinki, Finland - The Finnish capital is working hard to improve conditions for cyclists, with over 800 miles (1280 km) of bicycle infrastructure and 12 miles (19 km) of bike lanes.

© Reuters

Helsinki, Finland - Developers also want to construct a bike lane network in the city center, to be opened in 2020.

© Reuters

Vienna, Austria - Vienna continues to strengthen its security for cyclists. Last year saw the campaign #warumfährstDUnicht? (#whydontYOUcycle?), which boosted bike-riding in the city.

© Reuters

Vienna, Austria - The city hasn't invested millions in bike-friendly services, but Vienna remains a predictably safe city for riders.

© Reuters

Paris, France - The bustling French capital has made huge strides to boost cycling. Bike lanes have opened up around the city, and more children are riding bikes than ever before.

© Reuters

Paris, France - It's estimated that 30% of traffic on Rue Rivoli is made up of cyclists. The Champs-Elysées has also had new installments to help bikers around the area.

© Reuters

Oslo, Norway - The Norweigan capital has a bike-friendly inner city, with cars banned from some parts of the center.

© Reuters

Oslo, Norway - There has also been big investment in curbing traffic through the city, with 1,000 car parking spots removed between 2017 and 2018.

© Reuters

Bordeaux, France - Bordeaux is an inventive city when it comes to biking. Cars have been banned from the famous Pont de Pierre, which has increased cycling by 20% in the area.

© Reuters

Bordeaux, France - Politicians have removed parking spots from the center, and there are over 60 miles of painted bike lines.

© Reuters

Strasbourg, France - Strasbourg has been praised as France's best city for cyclists, from the urban cycling network to the surrounding suburbs.

© Reuters

Strasbourg, France - New cyclists are welcome to explore the city on two wheels, with the Vélostras cycle highways connecting major locations.

© Reuters

Antwerp, Belgium - Antwerp continues to improve its conditions for cyclists. A recent bike plan has connected the city through safe bike lanes.

© Reuters

Antwerp, Belgium - There have also been major improvements to traffic light management and intersection improvements. There is a bicycle modal share of around 33%.

© Reuters

Utrecht, the Netherlands - The Netherlands has built a strong reputation for being bike-safe. Utrecht is one of the best examples, with world-class biking infrastructure.

© Reuters

Utrecht, the Netherlands - Reports show that less and less people are driving cars, while the bicycle modal share only continues to increase.

© Reuters

Amsterdam, the Netherlands - Beating Utrecht is big brother Amsterdam, with a world-famous reputation for boosting bike riders.

© Reuters

Amsterdam, the Netherlands - The city is developing "royal routes" to allow more bicycles. On top of this, cycle lanes are widening to accommodate the rush hour madness.

© Reuters

Copenhagen, Denmark - The Danish capital is a shining example of how to make a city cater towards cyclists. It's reported that 62% of people commute to school or work by bike.

© Reuters

Copenhagen, Denmark -

Currently, four bike bridges are being built around the city. On top of that, over 100 miles (160 km) of bike highways are already servicing cyclists.

While you're here, get to know these bike-obsessed celebs.

© Reuters