Recreational

Switzerland's Otter Bike hit the water last year with a modern motor-assist version of the classic tandem pedal boat. Now the flagship Explorer model is on its way to Florida thanks to a partnership with Nautical Ventures.

Shenzhen has rapidly grown from a fishing village to a megacity home to around 17 million. To help add a little greenery to the concrete megalopolis, Crossboundaries has turned a metro station roof into a large elevated park measuring 1.2 km long.

An ambitious new project could provide Helsinki with a sustainable source of heat and double as an attractive place for Fins to escape winter. Hot Heart envisions a series of manmade islands that store thermal energy and offer places for recreation.

Harley-Davidson's e-mobility venture, Serial 1, has officially announced its first four production models. Now up for pre-order, the ebikes will land in the US and Germany next year and, as expected, they're not cheap.

A design team comprising pro surfers and engineers has revealed its first product aimed at having eco-friendly fun on the water. The YuJet Surfer is an electric surfboard that's said to bring "the power of a jetski to a surfboard."

Copenhagen has its fair share of floating architecture, with BIG's floating housing and Urban Power's artificial islands being two examples. A project by Marshall Blecher and Fokstrot will add greenery-covered park-like islands to the city too.

A newly-opened treetop walkway in the UK is said to be the longest in the country. The 300-m (984-ft) path at Westonbirt Arboretum takes visitors into the tree canopy, providing a perspective that would otherwise not be possible, along with views out across the surrounding landscape.

A new attraction in the Czech Republic has visitors walking around with their heads in the clouds. The Sky Walk is a 55-m (180-ft)-high wooden walkway on top of a mountain. It is aimed at being both fun and educational, with a helter skelter-type slide providing a fast way down.

Polish architecture firm MFRMGR recently unveiled plans to renovate an offshore WWII era watch tower into a water sports hub and research center.

A student team at the Colorado School of Mines under the supervision of Dr Carsten Mehring has strapped a motor to Mehring's three-wheeled Streetflyer, enabling this "hang glider on wheels" to be effortlessly ridden on the flat.

A true holy grail of modern times, Pat's Backcountry Beverages portable beer system lets you make beer on the go using nothing more than a small packet of concentrate, a special water bottle carbonation system and water.

The 4D Sportsground is a multi-functional sports field that seamlessly rotates between three separate surfaces.