At https://usgs.entwine.io you can peruse more than 2,000 USGS 3D Elevation Program (3DEP) LiDAR datasets that have been made available through the AWS Public Dataset Program. The data amounts to 70,409,082,675,345 LiDAR points at the time of writing.
The datasets cover most of the USA and can be looked at in the browser using Potree-based or Cesium-based viewers. The data has been processed into the Entwine Point Tile format which combines JSON for metadata and LAZ for data for performance.