Mountain peak roads or cul-de-sac roads in the Alps
This list is only a beginning since I only list places where I have been myself. Italics for unpaved roads/paths.

Cycloclimbing.com

No. Name of placeHeight (m)
1. Pirovano 3008
2. Ötztaler Gletscherstraße 2803
3. Cime de la Bonette 2802
4. Große Speikkogel/Koralpenstrasse 2120
5. Eisenthalalm/Eisentalhöhe 2049
6. Panoramica delle Vette 1967

I sometimes use the (slightly modified) notation method for unpaved roads and paths from Centcols.org and their Chauvot guide: R1 is cyclable unpaved road. R1-2 is cyclable with difficulty on a race bicycle (mountainbike is recommended). R2 is where you will have to walk (with a road bike in any case). R3 is difficult to walk. S1 is a cyclable path (few such exists for race bikes). S2 is walking path. S3 difficult walking. S4 means carrying.
I give reference numbers to the Chauvot guide and to other guides from Centcols.org.