In the recently founded HOLIGRAIL (HOher LIst GRAvItational Lensing) project we use the 1m Telescope operated by the Argelander-Institut für Astronomie at Hoher List Observatory to monitor multiply-lensed quasars aiming at the determination of time-delays between the different light paths. These can be used to study the individual radial mass profile of the lensing galaxies, or -from a larger ensemble- to constrain the Hubble Constant H0. This programme has been inspired by the COSMOGRAIL project.

Apart from our scientific goals, the H0LIGRAIL project comprises a technical upgrade of the 1m Telescope and the introduction of a new lab course experiment, performing and analyzing H0LIGRAIL data, which is now part of the advanced lab course in Physics at Bonn University.