An ideal escape in the city center, whether rain or shine, the 10-hectare Botanisk Have (Botanic Gardens) feel organic and indulgent, and are a biodiverse (literal) hot spot, with around 10,000 plant species. The extensive outdoor gardens are free, but don’t skimp on a ticket to the 1874 cast-iron-and-glass Palmehus, which includes a complex of glass houses. The dominant Palmehus was inspired by London's no-longer-standing Crystal Palace. It dates from the 19th century, and its dense collection of plants from continents as far flung as Australia make for a quick, steamy escape. The main circular section features wrought-iron spiral staircases leading to an elevated walkway with a bird's-eye view of the "jungle" below. The butterfly house is a place of wonder, full of fluttering butterflies as well as incubators for glittering chrysalises.
At the north end of the gardens, a new 1.2-billion kroner Natural History Museum is under construction, overrunning its planned 2024 opening date. The $160 million construction will have a glass dome in line with the nearby Palmehuset and span three floors underground.