Hilo to Volcano is a pretty common "ultra runner" route that is a 50KM paved uphill climb from sea level (Hilo) to 3750 feet (Volcano). It is unusual as an FKT Route since the route includes a little out & back at the end to get to 50KM.  It is a once or twice a year annual social "event" in the community where many of the runners will get together for an unofficial go at the route; if not more often for those lucky enough to live in the area.  The route has a Strava Segment.

Pfeifferhorn TH-TH:
Start at trailhead, follow Red Pine Lakes trail past the lakes. Continue on obvious trail(s) to the ridge, where an obvious trail continues west along the ridge and up to the summit of the Pfeifferhorn (11,326'). Return to trailhead.  9 miles with 3800' of elevation gain.  Note that this route has a Strava Segment, but that seems to cut off the first and last 400m or so from the TH.  FKT times are car-to-car.

http://www.peaksofthebalkans.com/

The world's newest transnational hiking experience the Peaks of the Balkans Trail is a winner in the prestigious global awards. The 192-kilometre signposted Trail winds through the remote and unspoilt mountainous regions of Albania, Kosovo and Montenegro in the Southern end of the Dinaric Alps in South East Europe.

North Skyline Trail starting at the top of the pass via North Ogden Canyon Road.
This is a pretty popular hiking and biking trail. Best to start early. There are several places where you travel through meadows of flowers. 
https://www.alltrails.com/trail/us/utah/ben-lomond-peak-via-north-skyline-trail