Bogotá's Ave. Septima, normally clogged with traffic, noisy and polluted, looks like this these days - at least between 19th St. and 26th.

It's an experiment in what Mayor Gustavo Petro calls 'human transit,' but it's also necessity - the bridge over 26th St. is being replaced as part of the TransMilenio expansion project to the airport.

During this respite from traffic, the avenue is for walkers, skaters and cyclists - a sort of permanent Ciclovia. There are also cultural events.

The Institute of Recreation and Sports is lending bikes, although can only be used on these seven blocks.

The public bikes are popular - on a sunny day, hundreds of people use them.

One of the cultural events on the pedestrianized avenue - a jazz concert in the historic Jorge Eliecer Gaitan Theatre.

The Gaitan Theatre's handsome art deco building.