Hi Suze, I think you may be on to something here, since you are considering Mérida, maybe you can also consider a road trip through Extremadura as a whole?
The often overlooked and underrated Extremadura is, in my opinion, one of Spain’s most fascinating regions. It is full of time-warped old towns, castles, monasteries, and beautiful countryside. It is the region bordering Portugal to the west and was the homeland of many Conquistadors. For a potential road trip I would do something along these lines:
Start In Madrid drive to Cáceres
-Day 1: Cáceres: The old town of Cáceres is a UNESCO World Heritage Site and has a mix of Roman, Islamic, Gothic, and Renaissance styles.
-Day 2: Parque Nacional de Monfragüe: Day trip from Cáceres to this biosphere reserve, includes stunning cliffs & rock formation, plus many kinds of wildlife (especially noted for its Griffon vultures). Has some really great hiking trials.
-Day 3: Trujillo: This town is where some of Spain’s most famous(infamous) conquistadors came from. The town has a few baroque and Renaissance palaces and an interesting Museum of Francisco Pizarro, who led the expedition that conquered the Inca Empire.
-Day 4: Guadalupe: Has the beautiful Real Monasterio de Guadalupe. You can tour this monastery and its collection of art, jewels, illuminated manuscripts. You can also see two cloisters, one late-14th-century Mudéjar, the other Gothic.
-Day 5 and 6: Mérida: As you probably know Mérida has some of the best Roman ruins in Spain, I would actually spend two days there.
-Day 7: Zafra: On the way to Zafra stop by Castillo de Feria, an originally Moorish hilltop fort. Zafra itself is a white walled town nicknamed "Little Sevilla" and feels very "Moorish".
-Day 8: Jerez de los Caballeros: A very picturesque small town. The old town is surrounded by a Moorish wall with six gates. After it was conquered from the Moors, the town was transferred to the Knights Templar, who left their own architectural mark.
-Day 9: Monesterio: Finish your trip at Monesterio which is an unassuming little town that produces some best Jamón ibérico in all of Spain. You can find the real Museo del Jamón there, not those touristy ones you will find in Madrid.
End trip - Drive down to Sevilla (about an hour south of Monesterio).