Simon Calder explained on BBC Breakfast that Montenegro and Bulgaria are two of his favourite holiday destinations and the most affordable countries to visit this summer.

The travel guru explained that Montenegro is a beautiful destination and very cheap, while “in Eastern Europe, Bulgaria is obviously a very popular package holiday destination,” he said.

Experts at the travel blog Wander-lush described Montenegro as an “underrated and hidden gem” destination in Europe.

They explained: “From peak to shore, Montenegro is without a doubt one of the most beautiful countries in the Balkan region.”

They recommended Perast, Kotor and Durmitor National Park as some of the most beautiful spots in the country.

Kotor is a UNESCO World Heritage Site and “among the most enchanting fortified town centres on the Adriatic, and a worthy rival to Dubrovnik or Split”.

“The best way to experience Kotor is by ambling along the cobbled streets in the early morning before the crowds arrive. Climb up to St John’s (either via the official trail or via the Ladder of Kotor) for a birds-eye view of the rooftops and turquoise bay beyond,” the experts recommended.

Bulgaria is also an underrated European destination but equally beautiful, with golden beaches and vibrant cities.

Simon explained: “Your money goes further in Bulgaria! We’ve been telling everyone for years that Bulgaria is a great holiday destination, about how wonderful the weather is, how soft the sandy beaches are, the excellent hotels and of course the low cost of living there.”

Lonely Planet recommended visiting the Black Sea Coast and Sozopol, in Bulgaria, one of the most popular seaside towns in the country.

Travel experts at Voyagewithmel explained: “Sozopol is one of those unique places that takes you back through its historical foundations with its impressive architecture and archaeology. It enchants you with its cliff-backed shore views, golden beaches and crystal clear waters.”