#URIs that work with Overpass Turbo Go to Settings > Map and change the URI to your server of choice.
The default is: //{s}.tile.openstreetmap.org/{z}/{x}/{y}.png
The following tile servers also work:
- Humanitarian:
//{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png
- Mapnik, Grayscale:
//tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png
- Thunderforest