On his recommendation, Lambeck went to Holland in 1645 to continue his studies, and at the University of Amsterdam, came in contact with many scholars, especially the philologian Gerhard Johann Vossius.

He later left the Netherlands at his uncle's wish and went to Paris, where his relationship with the celebrated Holstenius, as well as his own abilities, secured him access to the most distinguished savants of his time.

After finishing his studies, Lambeck made a tour through France, Liguria, and Etruria, and spent two years in Rome, where under the special direction of his uncle, who had become papal librarian, he undertook classical and historical researches.

The physician Edward Browne on his travels while at Vienna in 1677 records - The worthy Petrus Lambecius his Library Keeper, and who is in great esteem with him,(Emperor Leopold) will usually find out some Books for him which he conceiveth may be acceptable.

While I was there he recommended a Translation of Religio Medici unto him, wherewith the Emperour (Leopold) was exceedingly pleased, and spake very much of it unto Lambecius, insomuch that Lambecius asked me whether I knew the Author,(Thomas Browne) he being of my own name, and whether he were living: And when he understood my near Relation to him, he became more kind and courteous than ever, and desired me to send him that Book in the Original English, which he would put into the Emperors Library: Lambeck died in Vienna on April 4, 1680.